build_image: clean up /usr/include better

We currently install a lot of stuff into /usr/include.  Many are empty
dirs (because we mask out header files), but a few things still get in
there because they don't use the standard "*.h" naming convention.

BUG=None
TEST=`./build_image` produced an image that had a lot less stuff in /usr/include
TEST=`cbuildbot {x86,amd64}-generic-full` worked

Change-Id: I7c2bee2f6a248ecb4f37e503240e9004999afe7e
Reviewed-on: https://gerrit.chromium.org/gerrit/44381
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: David James <davidjames@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
2 files changed